WO2016006714A1 - Dispositif d'allumage - Google Patents

Dispositif d'allumage Download PDF

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Publication number
WO2016006714A1
WO2016006714A1 PCT/JP2015/070083 JP2015070083W WO2016006714A1 WO 2016006714 A1 WO2016006714 A1 WO 2016006714A1 JP 2015070083 W JP2015070083 W JP 2015070083W WO 2016006714 A1 WO2016006714 A1 WO 2016006714A1
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WO
WIPO (PCT)
Prior art keywords
electrode
coupling
discharge
ground electrode
insulating substrate
Prior art date
Application number
PCT/JP2015/070083
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English (en)
Japanese (ja)
Inventor
池田　裕二
誠士 神原
Original Assignee
イマジニアリング株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by イマジニアリング株式会社 filed Critical イマジニアリング株式会社
Priority to US15/325,267 priority Critical patent/US20170251546A1/en
Priority to EP15818828.4A priority patent/EP3196994B1/fr
Priority to JP2016532995A priority patent/JP6598081B2/ja
Publication of WO2016006714A1 publication Critical patent/WO2016006714A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/52—Generating plasma using exploding wires or spark gaps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/06—Fuel-injectors combined or associated with other devices the devices being sparking plugs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P23/00—Other ignition
    • F02P23/04—Other physical ignition means, e.g. using laser rays
    • F02P23/045—Other physical ignition means, e.g. using laser rays using electromagnetic microwaves
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/22—Sparking plugs characterised by features of the electrodes or insulation having two or more electrodes embedded in insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/34—Sparking plugs characterised by features of the electrodes or insulation characterised by the mounting of electrodes in insulation, e.g. by embedding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/52—Sparking plugs characterised by a discharge along a surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
    • F02B2023/085—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition using several spark plugs per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
    • F02P15/02—Arrangements having two or more sparking plugs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/01—Electric spark ignition installations without subsequent energy storage, i.e. energy supplied by an electrical oscillator

Definitions

  • the present invention relates to an ignition device for an internal combustion engine, and more particularly to an ignition device that ignites only with electromagnetic waves.
  • an ignition device for ignition of an internal combustion engine an ignition device using a plasma generation device that generates electromagnetic wave plasma by radiating electromagnetic waves into a combustion chamber of the internal combustion engine has been proposed.
  • Japanese Unexamined Patent Application Publication Nos. 2009-38025 and 2006-132518 describe an ignition device for an internal combustion engine using this type of plasma generation apparatus.
  • Japanese Unexamined Patent Application Publication No. 2006-132518 discloses an ignition device for an internal combustion engine that generates a plasma discharge by radiating an electromagnetic wave from an electromagnetic wave radiator into a combustion chamber.
  • An ignition electrode insulated from the piston is provided on the upper surface of the piston.
  • the ignition electrode serves to locally increase the electric field strength of the electromagnetic wave in the combustion chamber in the vicinity thereof.
  • the internal combustion engine ignition device generates plasma discharge in the vicinity of the ignition electrode. Since this plasma generator uses only electromagnetic waves to generate plasma, only one power source is required, but in order to cause ignition and combustion reactions with only electromagnetic waves, it is necessary to supply a large amount of power from a high-frequency power source.
  • an ignition electrode is required on the top surface of the piston, special processing is required for the piston separately.
  • the ignition device integrally includes an electromagnetic wave oscillator that oscillates an electromagnetic wave, a control device that controls the electromagnetic wave oscillator, a booster circuit that includes a resonance circuit that is capacitively coupled to the electromagnetic wave oscillator, and a discharge electrode that discharges a high voltage generated by the booster circuit. To be formed.
  • the above-mentioned ignition device is small and can be arranged in a large number in the combustion chamber of an internal combustion engine, it has a cylindrical shape due to its structure, and in order to be attached to the internal combustion engine, a desired attachment port with a thread is provided. It must be formed on the engine head. Also, for example, in applications where large diesel engine truck fuel in the used car market is replaced with gas fuel, it is difficult to ignite by itself, so it is necessary to install ignition means in the vicinity of the injector. In order to arrange the ignition device without working, there is a problem that further reduction in size and thickness is necessary.
  • the present invention has been made in view of such a point, and an object thereof is an ignition device that boosts an electromagnetic wave supplied by a resonance structure and raises a potential difference between a discharge electrode and a ground electrode to cause discharge, It is an object to provide an ignition device that can be reduced in size and thickness, in particular, reduced in thickness.
  • the first invention made to solve the above problems is On the main surface of the rectangular insulating substrate, An input electrode connected to an external terminal on one short side; A coupling electrode capacitively coupled to the input electrode; A discharge electrode connected to the other short side by the coupling electrode and a coupling line; A ground electrode that is capacitively coupled between the coupling electrode and the coupling line on both long sides of the main surface of the rectangular insulating substrate and extends to the other short side; A resonance circuit is formed by the capacitor constituted by the capacitive coupling and the inductor constituted by the coupling line, and the electromagnetic wave supplied from the external terminal to the input electrode is resonated to increase the potential difference between the discharge electrode and the ground electrode and discharge.
  • the ignition device is designed to cause
  • the ignition device of the present invention has a pattern of a coupling electrode, a coupling line, a discharge electrode and a ground electrode formed of a conductive paste mainly composed of a metal powder such as tungsten on the main surface of a ceramic substrate such as alumina.
  • a resonant circuit is formed by the capacitor and the inductor configured, and the electromagnetic wave supplied from the external terminal connected to the input electrode is resonated at one short side (end face) of the insulating substrate to boost the voltage, and the other short side (end face) ) Between the discharge electrode and the ground electrode. Since such a thin insulating substrate functions as an ignition device, the degree of freedom of the mounting location of the internal combustion engine can be greatly improved, and it can be incorporated into the tip of the injector, the intake / exhaust valve, and the gasket.
  • a first rectangular insulating substrate having an input electrode connected to an external terminal at one short side on the main surface;
  • a main electrode has a coupling electrode capacitively coupled to the input electrode, a discharge electrode connected to the other short side by the coupling electrode and a coupling line, and a discharge ground electrode adjacent to the discharge electrode on the other short side.
  • a resonance circuit is constituted by the capacitor constituted by the capacitive coupling and the inductor constituted by the coupling line, and the electromagnetic wave supplied from the external terminal to the input electrode is resonated to increase the potential difference between the discharge electrode and the ground electrode for discharging.
  • the ignition device is designed to cause
  • the capacitive coupling of the coupling electrode and the ground electrode and the coupling line and the ground electrode is performed between the layers, the discharge between the capacitive couplings that may occur when capacitive coupling is performed on the same main surface. Can be prevented.
  • the substrate between the discharge electrode on the other short side and the ground electrode can be cut out. Thereby, a sufficient discharge space can be formed between the discharge electrode and the ground electrode.
  • a rectangular insulating substrate having an input electrode, a coupling electrode, a coupling line, a discharge electrode, and a ground electrode can be laminated so that the resonance frequency of the resonance circuit is different.
  • the electromagnetic wave supplied in any of the ignition devices resonates and discharge occurs between the discharge electrode and the ground electrode.
  • the interval between the different resonance frequencies be equal to or less than the half-value width, so that the discharge can be reliably performed even when the Q value is configured to be high.
  • the resonance frequency can be changed by adjusting the length of the coupling line and the distance between the coupling line and the ground electrode. Further, a resonance frequency can be changed by providing a diode between the coupling line and the ground electrode.
  • An ignition device is an ignition device that boosts an electromagnetic wave supplied by a resonance structure to increase a potential difference between a discharge electrode and a ground electrode to generate a discharge.
  • the ignition device has a small size, particularly a ceramic substrate with a thickness of 200 ⁇ m. Since it can be manufactured in the following, it is possible to provide an ignition device that is thinned to about 1 mm even when a plurality of sheets are laminated.
  • Embodiment 1 shows an ignition device according to Embodiment 1, wherein (a) is a plan view of an insulating substrate that functions as an ignition device, (b) a perspective view showing a state before the insulating substrate and a protective substrate are stacked, and (c) is an insulating substrate. It is a perspective view which shows the state which laminated
  • the ignition device of the modification of Embodiment 1 is shown, (a) is a top view of the insulating substrate which functions as an ignition device, (b) The perspective view which shows the state before laminating
  • FIG. It is the schematic which shows the example which attached the said ignition device to the intake exhaust valve of an internal combustion engine, (a) is a front view, (b) is a bottom view. It is a perspective view which shows the state before laminating
  • FIG. It is an equivalent circuit which shows the pressure
  • the ignition device of Embodiment 3 is shown, (a) is a perspective view, (b) is a front view, (c) is a perspective view of a modification.
  • the main surface (e) is a layer on the back surface of the fourth substrate.
  • the ignition device 1 which concerns on this invention.
  • the ignition device 1 includes an input electrode 3 connected to an external terminal on one principal side of a rectangular insulating substrate 2A (hereinafter referred to as an insulating substrate 2A) on one short side 20a of the substrate,
  • the coupling electrode 4 capacitively coupled to the input electrode 3, the discharge electrode 6 connected to the other short side 20b by the coupling electrode 4 and the coupling line 5, and the long sides 21a and 21b of the main surface of the insulating substrate 2A
  • the ground electrode 7 which is capacitively coupled between the coupling electrode 4 and the coupling line 5 and extends to the other short side 20b.
  • the ignition device 1 resonates the electromagnetic wave supplied from the electromagnetic wave transmitter MW to the input electrode via the external terminal, and increases the potential difference between the discharge electrode 6 and the ground electrode 7 to cause discharge.
  • the insulating substrate 2A of the ignition device 1 is formed by firing a powder (hereinafter referred to as a ceramic raw material) of ceramics (for example, alumina (Al 2 O 3), aluminum nitride, cordierite, mullite, etc.).
  • a ceramic raw material for example, alumina (Al 2 O 3), aluminum nitride, cordierite, mullite, etc.
  • the ignition device 1 can be formed by using a single-layer ceramic insulating substrate 2. Specifically, a uniform slurry is produced by adding a binder / solvent to the ceramic raw material and mixing and grinding. Thereafter, the mixture is granulated by spray drying (spray drying) to form granules.
  • the granules are formed into a ceramic molded body having a desired shape by CIP molding (cold isostatic pressing), press molding, injection molding or the like, and then fired in a firing furnace.
  • CIP molding is suitable for molding small plate-like bodies by placing granules in a rubber mold and molding using water pressure
  • press molding is a process for placing granules in a mold and molding. It is the most suitable as a method of forming the insulating substrate 2 having the form.
  • the input electrode 3, the coupling electrode 4, the coupling line 5, and the discharge electrode 6 have the above-described configuration of the conductive paste mainly composed of metal powder (for example, silver, copper, tungsten, molybdenum, etc. having low electrical resistance) (FIG. 1 ( Print on the insulating substrate 2 ⁇ / b> A by a method such as screen printing, as shown in a).
  • metal powder for example, silver, copper, tungsten, molybdenum, etc. having low electrical resistance
  • a cutout portion K by cutting out the substrate between the discharge electrode 6 and the ground electrode 7 located on the other short side 20b.
  • a sufficient discharge space is formed between the discharge electrode 6 and the ground electrode 7, and the discharge between the discharge electrode 6 and the ground electrode 7 can be reliably generated. it can.
  • the protective substrate 2D is overlaid so as to cover the electrode surface of the insulating substrate 2A and laminated by applying heat and pressure.
  • the protective substrate 2D is slightly shorter than the insulating substrate 2A, and the input electrode 3 and a part of the ground electrode 7 of the insulating substrate 2A are exposed, and the input electrode 3 is connected to the electromagnetic wave transmitter MW through an external terminal (not shown).
  • the ground electrode 7 is grounded.
  • the boosting means includes a resonance structure capacitively coupled to the electromagnetic wave transmitter MW that emits electromagnetic waves (a capacitor constituted by capacitive coupling between the ground electrode 7, the coupling electrode 4, and the coupling line 5 and an inductor constituted by the coupling line). Resonance circuit).
  • the boosting means compares the resonance capacitance C2 of the capacitor (capacitor) C2 formed by the coupling electrode 4 and the ground electrode 7 and the resonance capacitance C3 of the capacitor (capacitor) C3 formed by the coupling line 5 and the ground electrode 7 with respect to C3.
  • each dimension is adjusted so that C2 becomes sufficiently large (C2 >> C3).
  • the electromagnetic wave is sufficiently boosted to a high voltage, and discharge (dielectric breakdown) can be performed between the discharge electrode 6 and the ground electrode 7.
  • the resonance capacitance C2 is a ground capacitance (floating capacitance) due to the capacitor C2 formed by the coupling electrode 4 and the ground electrode 7.
  • the resonance capacitance C2 is determined by the length of the coupling electrode 4 in the longitudinal direction, the distance between the coupling electrode 4 and the ground electrode 7, and the dielectric constant of the insulating substrate 2A.
  • the detailed dimensions of the portion of the capacitor C2 are designed to resonate according to the frequency of the electromagnetic wave (microwave) oscillated from the electromagnetic wave oscillator MW.
  • the resonant capacitance C3 is a discharge side capacitance (floating capacitance) due to the capacitor C3 formed by the coupling line 5 and the ground electrode 7.
  • the resonant capacitance C3 is determined by the length of the coupled line 5 in the longitudinal direction, the distance between the coupled line 5 and the ground electrode 7, and the dielectric constant of the insulating substrate 2A. In particular, it is desirable to reduce the resonance capacitance C3 as much as possible, and it is preferable to increase the distance between the coupling line 5 and the ground electrode 7. Alternatively, the insulating substrate 2A between the coupling line 5 and the ground electrode 7 may be cut away to reduce the dielectric constant, thereby reducing the resonant capacitance C3.
  • C1 in the equivalent circuit shown in FIG. 5 indicates a capacitive coupling portion between the input electrode 3 and the coupling electrode 4, and matches the impedance with the electromagnetic wave transmitter MW.
  • the plasma generation operation (ignition operation) of the ignition device 1 will be described.
  • discharge is generated due to a potential difference between the discharge electrode 6 and the ground electrode 7, plasma is generated in the vicinity of the discharge electrode 6 and the ground electrode 7 (discharge part), and the injected fuel is ignited.
  • a control device In a specific plasma generation operation (ignition operation), first, a control device (not shown) outputs an electromagnetic wave oscillation signal having a predetermined frequency f. This transmission signal is transmitted according to the crank angle of the internal combustion engine (usually before the compression top dead center (TDC)).
  • TDC compression top dead center
  • the electromagnetic wave oscillator MW that receives power from an electromagnetic wave power source (not shown) outputs an electromagnetic wave pulse having a frequency f at a predetermined duty ratio over a predetermined set time.
  • the electromagnetic wave pulse output from the electromagnetic wave oscillator MW becomes a high voltage by the boosting means of the ignition device 1 whose resonance frequency is f.
  • the mechanism for achieving a high voltage is that the resonant capacitances (stray capacitances) C2 and C3 are configured such that C2 is sufficiently larger than C3, and the stray capacitance between the coupling line 5 and the ground electrode 7 is set.
  • the resonant circuit is configured by the stray capacitance C2 between C3 and the coupling electrode 4 and the ground electrode 7 and the coil (corresponding to the coupling line 5 (equivalent to L1 of the equivalent circuit)).
  • the boosted electromagnetic wave increases the potential difference between the discharge electrode 6 and the ground electrode 7 to cause discharge and spark. By this spark, electrons are emitted from gas molecules generated in the vicinity of the discharge part, plasma is generated, and the fuel is ignited.
  • the electromagnetic wave from the electromagnetic wave transmitter MW may be a continuous wave (CW).
  • FIG. 3 shows an example in which the ignition device 1 is attached to an intake valve 91 and an exhaust valve 92 (hereinafter simply referred to as a poppet valve 9) of the internal combustion engine 8.
  • the poppet valve 9 is such that the short side 20b where the discharge electrode 6 and the ground electrode 7 of the ignition device 1 are formed is located at the center of the surface exposed to the combustion chamber 80 of the umbrella portion 9a of the poppet valve 9. It is arranged in the inside. And it comprises so that the electromagnetic waves from electromagnetic wave transmitter MW may be supplied to the input electrode 3 via transmission paths, such as a coaxial cable in the axial part 9b. In this way, ignition operation can be performed from four locations for one combustion chamber 80 of the internal combustion engine 8.
  • a spark plug used in a normal gasoline engine can be disposed at the center of the cylinder head 82.
  • the ignition device 1 can also be incorporated in a gasket 83 disposed between the cylinder block 81 and the cylinder head 82.
  • the number of ignition devices 1 to be installed in the gasket 83 is not particularly limited, but it is preferable to arrange the ignition devices 1 at a plurality of locations (4 to 8 locations) at equal intervals on the circumference of the bore.
  • the type of fire that ignites the fuel is generated on the outer periphery, and in the direction of flame propagation (in the case of a normal gasoline engine, flame propagation is directed from the inside to the outside, and the heat loss from the cylinder wall surface Is a major factor in reducing thermal efficiency.) Is directed from the outside to the inside, and the heat loss can be significantly reduced.
  • Embodiment 1 Since the ignition device 1 of Embodiment 1 can boost electromagnetic waves and perform discharge, the overall outer diameter of the device can be greatly reduced in size.
  • insulating substrates 2A1 to 2A5 are stacked.
  • the resonance frequency varies depending on the degree of overlap between the input electrode 3 and the coupling electrode 4 and the distance between the coupling electrode 4 and the ground electrode 7, but the length L of the coupling line 5, the coupling line 5 and the ground electrode 7.
  • the resonance frequency varies greatly by changing the distance D.
  • the length L of the coupled line 5 and the distance D between the coupled line 5 and the ground electrode 7 shown in FIG. It is designed to be a substrate.
  • the insulating substrate 2 of the ignition device 1 can be formed by the above-described method. However, since it is desired that the insulating substrate 2 be a thin substrate for laminating a plurality of insulating substrates 2, for example, when formed of alumina ceramics, A raw material powder composed of alumina (Al 2 O 3) and a sintering aid (binder such as silica (SiO 2)) is mixed to produce a milky slurry. The formed slurry is formed into a sheet-like ceramic raw sheet (green sheet) by a doctor blade method, a calender roll method or the like, and thereafter, the input electrode 3, the coupling electrode 4, the coupling line 5, the discharge electrode 6 and the ground electrode 7 are formed.
  • the insulating substrate 2 is formed by printing a conductive paste mainly composed of metal powder (for example, silver, copper, tungsten, molybdenum, etc. having low electric resistance) by a technique such as screen printing.
  • Resonant frequencies of the insulating substrates 2A1 to 2A5 are, for example, 2.41 GHz for the insulating substrate 2A1, 2.43 GHz for the insulating substrate 2A2, 2.45 GHz for the insulating substrate 2A3, 2.47 GHz for the insulating substrate 2A4, and 2.47 GHz for the insulating substrate 2A5.
  • the half-width is about 0.2 to 0.4 GHz (Q value is about 61 to 122)
  • the frequency of the 2.45 GHz electromagnetic wave oscillated from the electromagnetic wave transmitter MW is fluctuated.
  • a discharge can be generated between the discharge electrode 6 and the ground electrode 7 formed on any one of the insulating substrates 2A1 to 2A5.
  • the resonance frequencies of the insulating substrates 2A1 to 2A5 can be set to 2.43 GHz to 2.47 GHz in increments of 0.01, and the Q value can be set to about 245.
  • the Q value is the frequencies w1 and w2 (w1 ⁇ w2) at which the energy is halved across the resonance frequency w0 and the resonance frequency w0 of the resonance circuit, w0 / (w2-w1) It is a value represented by
  • the protective substrate 2D is overlaid on the upper surface of the insulating substrate 2A5 from which the electrode surface is exposed among the stacked insulating substrates 2A1 to 2A5 so as to cover the electrode surface of the insulating substrate 2A5.
  • the organic binder contained in the green sheet plays a role of glue in the interlayer adhesion, and the ignition device 1 for the multilayer ceramic insulating substrate is completed.
  • the ignition device 1 by forming the ignition device 1 by laminating the insulating substrates having different resonance frequencies, it is possible to generate a discharge with a high output even if the frequency of the electromagnetic wave oscillated from the electromagnetic wave transmitter MW fluctuates. .
  • the ignition device 1 which concerns on this invention.
  • the ignition device 1 includes a first rectangular insulating substrate 2A1 having an input electrode 3 connected to an external terminal at one short side on a main surface, and a first rectangle on a main surface.
  • a third rectangular insulating substrate 2C having a ground electrode 7a and a ground electrode 7b joined by a via B for interlayer conduction; and at least one rectangular insulating substrate 2A, 2B, 2C is stacked and configured by capacitive coupling Capacitors and coupling lines Ignition is configured such that a resonant circuit is configured by an inductor configured to resonate an electromagnetic wave supplied from an external terminal to an input electrode, thereby increasing a potential difference between the discharge electrode 6 and the discharge ground electrode 7a.
  • the rectangular insulating substrates 2A to 2C (hereinafter referred to as insulating substrates 2A to 2C) of the ignition device 1 are made of ceramics (for example, alumina, aluminum nitride, cordierite, mullite, etc.) as in the modification of the first embodiment.
  • ceramics for example, alumina, aluminum nitride, cordierite, mullite, etc.
  • a raw material powder made of alumina (Al 2 O 3) and a sintering aid (binder, eg, silica (SiO 2)) is mixed to produce a milky slurry.
  • the produced slurry is formed into a sheet-like ceramic raw sheet (green sheet) by a doctor blade method, a calender roll method, or the like, and then the input electrode 3 is used as the insulating substrate 2A, the coupling electrode 4, the coupling line 5, the discharge electrode 6, and the discharge.
  • the ground electrode 7a is joined to the insulating substrate 2B, and the ground electrode 7b joined to the discharge ground electrode 7a with the via B for interlayer conduction is applied to the insulating substrate 2C.
  • Metal powder for example, silver, copper, tungsten, molybdenum, etc. having low electrical resistance
  • Is formed by printing a conductor paste mainly composed of by a technique such as screen printing.
  • This ignition device 1 is provided with the input electrode 3 and the coupling electrode 4 which are equivalent to C1 of the equivalent circuit on different insulating substrates, and reliably prevents dielectric breakdown between the input electrode 3 and the coupling electrode 4. Further, impedance matching between the input electrode 3 and the coupling electrode 4 with the electromagnetic wave transmitter MW can be easily performed by the length and thickness of the input electrode 3 and the coupling electrode 4.
  • ground electrode 7 (7c) constituting the equivalent circuit C2 with the coupling electrode 4 and the ground electrode 7 (7b) constituting the equivalent circuit C3 with the coupling line 5 are respectively formed on different insulating substrates 2C. I am trying to provide it.
  • the ground electrode 7b and the ground electrode 7c are provided on separate insulating substrates 2C2 and 2C1, respectively.
  • the resonance capacitance (floating capacitance) C3 of the equivalent circuit C3 configured with the coupling line 5 be as small as possible.
  • the resonance capacitance (stray capacitance) C3 can be reduced.
  • a plurality of insulating substrates 2C1 are laminated between the insulating substrate 2B and the insulating substrate 2C2, thereby further reducing the resonance capacitance (floating capacitance) C3.
  • a stub pattern 5a (open stub) can be provided on the coupled line 5 of the insulating substrate 2B.
  • the stub pattern 5a may be provided on the insulating substrate 2A and electrically connected to the coupling line 5 of the insulating substrate 2B through a via for interlayer conduction (see the two-dot chain line on the right side of the lower diagram in FIG. 4).
  • the stub pattern 5a can be provided on the input electrode 3 (see the two-dot chain line on the left side of the lower diagram in FIG. 4). Impedance matching can be effectively achieved by providing the stub pattern 5a on the input electrode 3 upstream of the electromagnetic wave input.
  • each electrode is formed on each of the insulating substrates 2A to 2C, and the protective substrate 2D is overlaid so as to cover the uppermost electrode surface, and is laminated by applying heat and pressure.
  • the organic binder contained in the green sheet plays a role of glue in the interlayer adhesion, and the ignition device 1 for the multilayer ceramic insulating substrate is completed.
  • the plasma generation operation (ignition operation) of the ignition device 1 is caused by a potential difference between the discharge electrode 6 and the discharge ground electrode 7a, and the discharge electrode 6 and the discharge ground electrode 7a (discharge unit). Plasma is generated in the vicinity of, and the injected fuel is ignited.
  • the ignition device 1 can boost the electromagnetic wave and perform discharge.
  • the stray capacitance C3 between the coupling line 5 and the ground electrode 7 which needs to be made as small as possible out of the stray capacitance of the resonance circuit constituting the boosting means, and the coupling line 5 and the ground electrode 7 are different from each other.
  • 2B and the insulating substrate 2C are made sufficiently smaller than the stray capacitance C2 between the coupling electrode 4 and the ground electrode 7, and the supplied electromagnetic wave is sufficiently boosted to a high voltage so that the discharge electrode 6 is grounded. It can be discharged between the electrodes 7.
  • the electrode part used as capacitive coupling is not printed on the same board
  • Embodiment 3 is the ignition device 1 which concerns on this invention.
  • the ignition device 1 is configured by laminating a first rectangular insulating substrate P1 to a fifth rectangular insulating substrate P5.
  • the material of each rectangular insulating substrate is not particularly limited, but as in the first embodiment, ceramic (for example, alumina (Al 2 O 3 ), aluminum nitride, cordierite, mullite, etc.) powder (hereinafter referred to as ceramic raw material) Are fired).
  • Each layer formed on the main surface (including the back surface) of each rectangular insulating substrate is not particularly limited in material or the like, but as in the first embodiment, metal powder (for example, silver having low electrical resistance) , Copper, tungsten, molybdenum, etc.) on each rectangular insulating substrate by means of screen printing or the like so as to have the shape of each layer (see FIGS. 7A to 7E). It is configured by printing.
  • metal powder for example, silver having low electrical resistance
  • a layer formed on each rectangular insulating substrate (hereinafter simply referred to as a substrate) will be described.
  • a via 40 for communicating with the ground electrode 7 and the antenna line 31 is formed in the layer L1 on the main surface of the first substrate P1.
  • the antenna line 31 connected to the via 40 is formed in the layer L2 on the back surface of the first substrate P1.
  • the via 40 is connected to the electromagnetic wave transmitter MW2 through, for example, a coaxial cable.
  • the main surface is not printed with a layer, and a via 40 connected to one end of the antenna 30 on the back surface is formed.
  • the antenna 30 connected to the via 40 is formed on the layer L3 on the back surface of the second substrate P2.
  • the fourth substrate P4 has the same configuration as that of the first embodiment on the main surface, the input electrode 3 connected to the external terminal in the vicinity of one short side, and the coupling electrode capacitively coupled to the input electrode 3 4, the discharge electrode 6 connected to the other short side by the coupling electrode 4 and the coupling line 5, and both long sides are capacitively coupled between the coupling electrode 4 and the coupling line 5, and the other short side And a ground electrode 7 which forms a predetermined gap with the discharge electrode.
  • a via 42 connected to the back surface is formed in a portion connected to the external terminal in the vicinity of one short side.
  • the positional relationship between the input electrode 3 and the coupling electrode 4 may be the positional relationship shown in FIG.
  • the via 42 is connected to the electromagnetic wave transmitter MW1 through, for example, a coaxial cable.
  • the third substrate serves as a spacer for providing a predetermined distance between the discharge electrode 6 formed on the main surface of the fourth substrate P4 and the antenna 30 formed on the back surface of the second substrate P2. Plays.
  • the ignition device of the present embodiment is configured by stacking a substrate on which the insulating substrate 2D of the first embodiment is used as a spacer and having a predetermined thickness and on which an antenna for supplying energy to the discharge unit is formed. ing.
  • the resonance structure and the voltage boosting unit are the same as those in the first embodiment, and the description is omitted. Further, as in the first embodiment, the substrate between the discharge electrode 6 and the ground electrode 7 may be cut out to form a cutout portion.
  • the ignition operation of the ignition device 1 is similar to the first embodiment.
  • a control device (not shown) outputs an electromagnetic wave oscillation signal having a predetermined frequency f.
  • This transmission signal is transmitted according to the crank angle of the internal combustion engine (usually before the compression top dead center (TDC)).
  • the electromagnetic wave oscillator MW1 that receives power supply from an electromagnetic wave power source (not shown) outputs an electromagnetic wave pulse having a frequency f with a predetermined duty ratio over a predetermined set time.
  • the electromagnetic wave pulse output from the electromagnetic wave oscillator MW1 becomes a high voltage by the boosting means of the ignition device 1 whose resonance frequency is f.
  • the mechanism for achieving a high voltage is that the resonant capacitances (stray capacitances) C2 and C3 are configured such that C2 is sufficiently larger than C3, and the stray capacitance between the coupling line 5 and the ground electrode 7 is set.
  • the resonant circuit is configured by the stray capacitance C2 between C3 and the coupling electrode 4 and the ground electrode 7 and the coil (corresponding to the coupling line 5 (equivalent to L1 of the equivalent circuit)).
  • the boosted electromagnetic wave increases the potential difference between the discharge electrode 6 and the ground electrode 7 to cause discharge and spark.
  • an electromagnetic wave (microwave) oscillated from the electromagnetic wave oscillator MW2 is radiated to the discharge plasma from the antenna 30, energy is supplied to the discharge plasma, and the non-equilibrium plasma is maintained / expanded.
  • Embodiment 3- By configuring the substrate circuit for generating the discharge plasma and the antenna circuit for supplying electromagnetic waves as energy to the discharge plasma in one laminated circuit, even a small ignition device can ignite the fuel. A large volume ignition is ensured and the combustion efficiency is remarkably improved.
  • an electromagnetic wave supplied as energy to the discharge plasma is used as a reflected wave of the electromagnetic wave supplied from the electromagnetic wave transmitter MW1 toward the discharge electrode 3.
  • a circulator SQ in which the first port is connected to the electromagnetic wave transmitter MW1, the second port to the via 43, and the third port to the via 40 is interposed between the electromagnetic wave transmitter MW1 and the input electrode 3, and after discharge The generated reflected wave is supplied to the antenna 30 via the third port.
  • the ignition device of the present invention is a small-diameter and thin-type ignition device capable of boosting electromagnetic waves and discharging, and has a high degree of freedom in arrangement position and can be used for various internal combustion engines. Can do.
  • the ignition system is based on gasoline engines and diesel engines, and is based on internal combustion engines that use natural gas, coal mine gas, shale gas, etc., especially diesel engines. From the viewpoint of improvement, it can be used in addition to an injector of an engine that uses gas (CNG gas or LPG gas) as fuel.
  • gas CNG gas or LPG gas

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Spark Plugs (AREA)

Abstract

Le problème décrit par la présente invention est de fournir un dispositif d'allumage dans lequel la tension d'une onde électromagnétique fournie au moyen d'une structure résonante est amplifiée, et la différence de potentiels entre une électrode de décharge et une électrode de masse est augmentée, produisant une décharge, ledit dispositif d'allumage étant rendu plus petit et plus mince, en particulier plus mince. La solution selon l'invention porte sur un dispositif d'allumage comprenant : une électrode d'entrée 3 connectée à une borne externe sur un côté court sur la surface principale d'un substrat isolant rectangulaire 2 ; une électrode de couplage 4 couplée de manière capacitive avec l'électrode d'entrée 3 ; une électrode de décharge 6 connectée à l'électrode de couplage 4, par l'intermédiaire d'une ligne de couplage 5, sur l'autre côté court ; et une électrode de masse 7 couplée de manière capacitive entre l'électrode de couplage 4 et la ligne de couplage 5 sur les deux côtés longs de la surface principale du substrat isolant rectangulaire 2, et s'étendant vers l'autre côté court. Un circuit résonnant est constitué par un inducteur constitué par la ligne de couplage 5 et un condensateur constitué par couplage capacitif. Une onde électromagnétique est fournie à l'électrode d'entrée à partir du résonateur de borne externe, et la différence de potentiels entre l'électrode de décharge 6 et l'électrode de masse 7 est augmentée, produisant une décharge.
PCT/JP2015/070083 2014-07-11 2015-07-13 Dispositif d'allumage WO2016006714A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US15/325,267 US20170251546A1 (en) 2014-07-11 2015-07-13 Ignition device
EP15818828.4A EP3196994B1 (fr) 2014-07-11 2015-07-13 Dispositif d'allumage
JP2016532995A JP6598081B2 (ja) 2014-07-11 2015-07-13 点火装置

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JP2014-143648 2014-07-11
JP2014143648 2014-07-11

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WO2016006714A1 true WO2016006714A1 (fr) 2016-01-14

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EP (1) EP3196994B1 (fr)
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WO (1) WO2016006714A1 (fr)

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Publication number Priority date Publication date Assignee Title
EP3150840B1 (fr) * 2014-05-29 2018-08-01 Imagineering, Inc. Injecteur comprenant un système d'allumage intégré
US20170306918A1 (en) * 2014-08-21 2017-10-26 Imagineering, Inc. Compression-ignition type internal combustion engine, and internal combustion engine
US10808643B2 (en) * 2018-04-28 2020-10-20 Dongguan University Of Technology Homogenous charge electromagnetic volume ignition internal combustion engine and its ignition method
US11621544B1 (en) 2022-01-14 2023-04-04 Federal-Mogul Ignition Gmbh Spark plug electrode and method of manufacturing the same

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JP2009038026A (ja) * 2007-07-12 2009-02-19 Imagineering Kk 点火プラグ及び分析装置
WO2011016569A1 (fr) * 2009-08-06 2011-02-10 イマジニアリング株式会社 Mélangeur, dispositif de réglage, unité d'allumage et générateur de plasma

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DE102004058925A1 (de) * 2004-12-07 2006-06-08 Siemens Ag Hochfrequenz-Plasmazündvorrichtung für Verbrennungskraftmaschinen, insbesondere für direkt einspritzende Otto-Motoren
WO2009008517A1 (fr) * 2007-07-12 2009-01-15 Imagineering, Inc. Contrôleur d'une région de formation de plasma et processeur de plasma
JP5875848B2 (ja) * 2011-12-16 2016-03-02 株式会社東芝 フォトカプラの製造方法及びフォトカプラ用リードフレームシート

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Publication number Priority date Publication date Assignee Title
JP2009038026A (ja) * 2007-07-12 2009-02-19 Imagineering Kk 点火プラグ及び分析装置
WO2011016569A1 (fr) * 2009-08-06 2011-02-10 イマジニアリング株式会社 Mélangeur, dispositif de réglage, unité d'allumage et générateur de plasma

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See also references of EP3196994A4 *

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EP3196994A1 (fr) 2017-07-26
EP3196994A4 (fr) 2017-10-11
EP3196994B1 (fr) 2018-05-16
JP6598081B2 (ja) 2019-10-30
US20170251546A1 (en) 2017-08-31
JPWO2016006714A1 (ja) 2017-05-25

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